View full sizeCourtesy of Portland TributeState police are asking the public's help to identify this man.

Oregon State Police are distributing a photo to try to track down an unidentified man holding a burning object in an investigation of a fire to the artificial turf at Reser Stadium that caused at least $1,500 in damage after the Oregon-Oregon State game Saturday.

The photo, by a Portland Tribune newspaper photographer, shows a man wearing a white No. 9 University of Oregon football jersey holding something burning in the air near the east end of the OSU logo around the 35-yard line as thousands of fans poured onto the field.

After the crowd cleared, a small section of the turf was found burned by an unknown material, state police said.

Police ask anyone who can identify the man or witnesses near the man to call Senior Trooper Orly Johnson at 541-737-3010 or e-mail at orly.johnson@oregonstate.edu.

They also want people to contact Johnson if they have their own photos or video of what happened.